- 2-iodo-3-keto-Δ4 steroids, process for their production, as well as their further processing
-
The new intermediate products of general formula I STR1 in which R1 stands for a hydrogen atom or a straight-chain or branched alkyl group with 1 to 4 carbon atoms, R2 stands for a hydrogen atom or a methyl group, R3 stands for a hydrogen atom, R4 stands for an acyloxy group with 1 to 4 carbon atoms in the acyl radical or R3 and R4 together stand for a keto-oxygen atom, are suitable in an excellent way for introducing a Δ1 double bond in the steroid skelton with the simultaneous presence of a Δ4 double bond, as well as a saturated carbonyl group, by clevage of hydrogen iodide with a base in an amidic solvent at elevated temperature. If R2 stands for a hydrogen atom, the A-ring is aromatized after the hydrogen iodide cleavage. For the production of a new intermediate products, special iodization processes, which partially also allow a stereoselective control of the iodization, are used.
- -
-
-